Computer reboots every 10-15 seconds

I just put together a new computer. I have everything plugged in correctly and everything is connected correctly. Everytime i turn it on, all fans turn, cpu fan turns on, both video cards start up, i can turn the led lights on, but the drives will not open up and the nothing displays on my monitor. It restarts over and over again every 10-15 seconds. Not sure what could be cause this issue.